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A neighbor is escorted to safety as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday. Full story (AP Photo/Charles Krupa)
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South Korean special police officers arrest a mock terrorist during an anti-terror drill at Government Complex in Sejong, south of Seoul, South Korea, Wednesday. (AP Photo/Lee Jin-man)
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A firefighter dressed in a protective suit walks out of a government mail screening facility in Hyattsville, Md., Wednesday. Police swept across the U.S. Capitol complex to chase a flurry of reports of suspicious packages and envelopes after preliminary tests indicated poisonous ricin in two letters sent to President Barack Obama and a Mississippi senator. Full story (AP Photo/Alex Brandon)
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An armed police officer stands guard as military personnel march past ahead of the ceremonial funeral procession for former British Prime Minister Margaret Thatcher in London, Wednesday. (AP Photo/Matt Dunham, Pool)
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Zimbabwean Soldiers and Police are seen during rehearsals for Independence day celebrations at the National Sports Stadium in Harare, Wednesday. (AP Photo/Tsvangirayi Mukwazhi)
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Riot police stand guard as demonstrators hold a rally outside U.S. Embassy to protest the 12-day joint military exercise between the Philippines and the United States, dubbed Balikatan 2013 (Shoulder-to-Shoulder) which ends later in the day, in Manila, Philippines, Wednesday. (AP Photo/Bullit Marquez)
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Police officials collect evidence at the site of an explosion at a residential neighborhood near the office of India’s main opposition Bharatiya Janata Party, in Bangalore, India, Wednesday. (AP Photo/Aijaz Rahi)